If you specifically want to learn Haskell (and I think Haskell is probably the best way to learn functional programming), Learn You a Haskell for Great Good is the best way to go. It's a practical book that explains a little bit of theory in a really easy to understand way. And, it's free online!
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If you specifically want to learn Haskell (and I think Haskell is probably the best way to learn functional programming), Learn You a Haskell for Great Good is the best way to go. It's a practical book that explains a little bit of theory in a really easy to understand way. And, it's free online!